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Chemical Papers

, Volume 67, Issue 2, pp 202–212 | Cite as

Effect of hyamine on electrochemical behaviour of brass alloy in HNO3 solution

  • Demet ÖzkırEmail author
  • Emel Bayol
  • A. Ali Gürten
  • Yavuz Sürme
  • Fatma Kandemirli
Original Paper

Abstract

The electrochemical behaviours of a brass alloy in 0.1 M nitric acid, including the hyamine inhibitor with concentrations between 2.5 × 10−4 M and 1.0 × 10−5 M, were studied. For this purpose, potentiodynamic polarisation, electrochemical impedance spectroscopy (EIS), linear polarisation resistance (LPR) techniques, and flame atomic absorption spectroscopy (FAAS) were utilised. The inhibitor molecules adsorbed on the brass surface were calculated to be in good agreement with the Langmuir adsorption isotherm and the standard free enthalpy of adsorption (ΔG ads ). Hyamine effectively improved the corrosion inhibition of brass and acted as a mixed-type inhibitor on alloy surfaces. The surface morphology of the alloy was also clarified by optical microscopic and SEM techniques. A theoretical study of the corrosion inhibition efficiency of hyamine molecule was carried out using density functional theory (DFT) at the B3LYP/6-311G(d,p) basis set level.

Keywords

electrochemical techniques computational techniques dezincification acid corrosion inhibitor brass 

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Copyright information

© Institute of Chemistry, Slovak Academy of Sciences 2012

Authors and Affiliations

  • Demet Özkır
    • 1
    Email author
  • Emel Bayol
    • 1
  • A. Ali Gürten
    • 2
  • Yavuz Sürme
    • 1
  • Fatma Kandemirli
    • 1
  1. 1.Department of Chemistry, Faculty of Arts and SciencesNigde UniversityNigdeTurkey
  2. 2.Department of Chemistry, Faculty of Arts and SciencesOsmaniye Korkut Ata UniversityOsmaniyeTurkey

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